标题：Influence of surface oxidation on the radiative properties of ZrB2-SiC composites
作者：Li, Ning; Xing, Pifeng; Li, Cui; Wang, Peng; Jin, Xinxin; Zhang, Xinghong
作者机构：[Li, Ning; Xing, Pifeng; Li, Cui] China Acad Engn Phys, Res Ctr Laser Fus, Mianyang 621900, Peoples R China.; [Wang, Peng] Shandong Univ Technol, Sc 更多
通讯作者地址：[Li, N]China Acad Engn Phys, Res Ctr Laser Fus, Mianyang 621900, Peoples R China.
来源：APPLIED SURFACE SCIENCE
关键词：ZrB2-SiC; Emissivity; Radiative properties; Surface oxidation
摘要：The spectral emissivities of ZrB2-20 vol.% SiC composites with various surface components of ZrB2/SiC (ZS1), silica-rich glass (ZS2) and porous zirconia (ZS3) were measured using infrared spectrometer in the wavelength range from 2.5 to 25.0 mu m. The relationship between surface oxidation (associated with surface component, thickness of oxide scale, testing temperature as well as roughness) and the radiative properties of ZrB2-SiC composites were investigated systematically. Surface component affected the radiative properties of composites significantly. The total emissivity of ZS1 varied from 0.22 to 0.81 accompanied with surface oxidation in the temperature range 300-900 degrees C. The emissivity of ZS(2) was about 1.5 times as that of ZS3 under the same testing conditions. The oxide scale on specimen surface enhanced the radiative properties especially in terms of short-wave range, and the emissivity in the long wave range gradually increased with the thickness of oxide scale within a certain range. The influence of testing temperature and surface roughness was also investigated. The testing temperature had a little effect on radiative properties, whereas effect of surface roughness could be negligible. (C) 2017 Elsevier B.V. All rights reserved.